CN103174681A - Variable speed twin-stage axial-flow local fan - Google Patents
Variable speed twin-stage axial-flow local fan Download PDFInfo
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- CN103174681A CN103174681A CN 201110427491 CN201110427491A CN103174681A CN 103174681 A CN103174681 A CN 103174681A CN 201110427491 CN201110427491 CN 201110427491 CN 201110427491 A CN201110427491 A CN 201110427491A CN 103174681 A CN103174681 A CN 103174681A
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Abstract
The invention provides a variable speed twin-stage axial-flow local fan and relates to an improvement of a structure of a twin-stage axial-flow local fan. The local fan has the advantages of being convenient to use, high in efficiency and wide in application range. The local fan comprises a rack and a motor installed inside the rack, the local fan is structurally characterized in that an output shaft of the motor extends from two ends of the motor, two ends of the output shaft are connected with a first class impeller and a second class impeller, a wind collecting machine is installed on the rack corresponding to the first class impeller, a posterior bite guide is installed on the rack corresponding to the second class impeller, the back portion of the posterior bite guide is provided with a diffuser, and the motor refers to a switch reluctance motor.
Description
Technical field
The present invention relates to a kind of improvement of twin-stage axial flow portable blower structure.
Background technique
Dig roadway in the coal mining engineering, be characterized in only having import, i.e. a single opening tunnel.Namely local ventilation of the ventilation of single opening tunnel, its task are the vitiated airs such as blasting fume, coal dust, gas and flue dust of getting rid of working surface, and fresh air is introduced working surface, guarantee safety of workers work.Local ventilation has total blast ventilation, diffusion ventilation, ejector to ventilate and local ventilation.Local ventilation is to commonly use in present production practices.It is divided into again forced, draw-out type and hybrid.
The axial flow booster is little due to size, lobe numbers is many, can't transfer blade as main fan, therefore, adjustable axial flow booster (except entry guide vane) is arranged not yet so far.
1, the characteristics of local ventilation, scheme and contrast thereof: booster (or claim portable blower) has following three types: i.e. diagonal flow type (or mixed-flow, meridian acceleration formula) portable blower, to revolving portable blower and single/double stage axial flow portable blower.Done detailed analysis in " present situation of mine fan and evaluation ".All types of evaluations are as follows
| Title | YBT,JBT | BKJ,2BKJ | To revolving | Oblique flow |
| Efficient | ★ | ★★★ | ★★★ | ★★★ |
| Performance curve | ★★★ | ★★★ | ★★★ | ★ |
| Air supplying distance | ★★ | ★★★ | ★★★ | ★ |
| Noise | ★ | ★★ | ★★ | ★★ |
| Compact structure | ★★★ | ★★★ | ★★ | ★★★ |
| Cost | ★★★ | ★★★ | ★★ | ★★★ |
YBT in table, JBT are five, the product that the sixties are introduced by the former Soviet Union, and efficient only has 60～73%; Noise reaches 127dB (A) sometimes up to 103～110dB (A).Shenyang Coalmine Safety office expressly forbids on March 21st, 09.BKJ, 2BKJ are its modified models, and the blade redesign adds silencing apparatus, and efficient reaches more than 80%.Ventilate applicable to extra long distance after, fans in series simple in structure to revolving.But be subjected to the impact of one-level outlet field, efficient is fatal weakness, experimental results show that lower than common twin-stage 2%; And the rotor relative velocity compared with normal value of bidirectional rotation doubles, therefore the noise intrinsic shortcoming that is it.Secondly often adopted when the initial stage, the air quantity negative pressure was less demanding at driving and only open the first order or the second level, the operation of another grade passive mode.Theory and practice proves, this its performance parameter of long journey mode and, operational efficiency is all very low, 55% left and right only.Diagonal flow fan pressure is low, air quantity is large, characteristic is smooth.Add adjustable leadingly, complex structure increases cost; Mine Dust is many, and easily incrustation blocks controlling mechanism, and the outlet dynamic pressure is large, and diffuser Design requires high, is only suitable for short distance and ventilates.
Secondly, for main fan, size is little, the number of blade is many due to portable blower.Usually blade all is welded on wheel disc, seldom has to shut down to transfer, and says nothing of shutdown and once connects accent.The way that changes performance is the series connection of whole level, be connected into twin-stage as single-stage, or twin-stage conspires to create three grades, level Four etc. to revolving.Buckle and latchplate is all adopted in general series connection; When needed, changeable progression is to satisfy the needs of driving process.No matter it should be noted that to revolving or common twin-stage, the efficient after dismounting all can be lower than intrinsic.As do not tear open efficient can be low more.
2, existing specific speed ns=nq0.5/ (p) 0.75 with several blower fans is listed in the table below:
Specific speed by level sees, all can reach higher performance with two mixed flows or meridian acceleration series winding or counter-rotating fan.But the mixed-flow stream rises and falls, and rotor is difficult to assurance with the casing gap.Meridian acceleration need to increase entry guide vane usually, and counter-rotating fan exists efficient to hang down and the high shortcoming of noise, and when particularly two rotor couplings were bad, the secondary rotor easily burnt.Twin-stage axial flow portable blower 2BKJ is actual is the serial type of single-stage axial flow portable blower BKJ.Constant and the blast of air quantity increases and is twice.Certainly also can do 3 grades, 4 grades very cause more multistage series winding.Tear or do not tear open another level when evidence is singly opened one-level open, efficient is respectively 0.772 and 0.578.Than twin-stage low 0.03 and 0.222.Analogue is also arranged on counter-rotating fan.As everyone knows: even if after electronic component series connection, voltage increases that resistance also will increase in addition is blower fan, single-stage is serially connected in another single-stage back will bear the impact that front surface field and motor disturb.This and real twin-stage are diverse.
Summary of the invention
The present invention is exactly for the problems referred to above, provide a kind of easy to use, efficient is high, a kind of speed change twin-stage axial flow portable blower that Applicable scope is wide.
For reaching above-mentioned purpose of the present invention, the present invention adopts following technological scheme, the present invention includes frame, is provided with motor in frame, the output shaft of its structure outline motor is stretched out by the two ends of motor, and the two ends of described output shaft are connected with sencond stage impeller with the one-level impeller respectively; Be provided with wind collecting unit corresponding to the one-level impeller on frame, lead after arranging corresponding to sencond stage impeller, after to lead the rear portion be Diffuser; Described motor is switched reluctance machines.
Beneficial effect of the present invention: 1, easy to use, efficient is high: adopt switched reluctance machines, can make motor stepless speed regulation; Thereby, obtain different air quantity, blast, satisfying the needs of different times tunnelling footage, and characteristics are as constant all the time in disregarding Reynolds number effect efficient, can realize maximum energy-conservation.And need not use the method for adjusting or dismounting I and II impeller, time saving and energy saving.
2, Applicable scope is wide: the present invention carries out speed change control by switched reluctance machines, and air supplying distance can reach 1000～1500 meters, belongs to long distance air-supply; And, also can suitably reequip, be connected in series and be level Four, air supplying distance can increase again and is twice, and becomes the tool of extra long distance air-supply.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.Protection scope of the present invention not only is confined to the statement of following content.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
In accompanying drawing, 1 leads in being for one-level impeller, 5,6 leads 10 for sencond stage impeller, 9 after being for output shaft, 8 for motor, 7 and be Diffuser for frame, 4 for hush pipe, 3 for wind collecting unit, 2.
Embodiment
The present invention includes frame 3, be provided with motor 6 in frame 3, the output shaft 7 of its structure outline motor 6 is stretched out by the two ends of motor 6, and the two ends of described output shaft 7 are connected with sencond stage impeller 8 with one-level impeller 4 respectively; Be provided with wind collecting unit 1 corresponding to one-level impeller 4 on frame 3, lead 9 after arranging corresponding to sencond stage impeller 8, leading 9 rear portions after having is Diffuser 10; Described motor 6 is switched reluctance machines.
Lead 5 in frame 3 in being provided with between one-level impeller 4 and sencond stage impeller 8, the air-flow after rotor is torqued into axially, and improve static pressure, also play the supporting effect of fixed electrical machinery 6 simultaneously; Because the switched reluctance machines volume is larger, therefore, when 4 air-supply of one-level impeller, can produce certain eddy current near motor 6 wire outlet seats; Can by rectifying box is set, can avoid the formation of eddy current; Better realize purpose of the present invention.
Described wind collecting unit 1 is outside equipped with hush pipe 2, and described Diffuser 10 is the blanking Diffuser; Can reduce noise, improve working environment.
Described motor 6 is connected with the magneto resistance speed-regulating device, can realize remote control to motor 6 by this device, and driving situation current according to the user can satisfy the needs of process at any time, need not repacking.Also can fall motor 6 and turn use, omnidistance efficient can remain unchanged substantially.Also can improve 10% revolution and use, to adapt to temperature change (20 ℃～30 ℃), make adaptability of the present invention stronger.
Described switched reluctance machines model is KCBF-110; The model of described magneto resistance speed-regulating device is ZJT-160/660KC-J1.
Laboratory report: the present invention has adopted accurate three-dimensional " the non-flow curvature Guan Liufa that the radially stands " computational flow of aerial blade machine technology, and with leaf grating method design blade, original blade profile is the blower fan blade profile of central fluid power institute of the former Soviet Union (Ц А Г И).
Adopted self-developing and the software kit of independent intellectual property right has been arranged.Computational speed and flow error be all less than 0.1%, comprises that moulding can complete about 10 seconds.
Key components and parts has all been done conventional strength checking, also excess revolutions 10% except satisfying performance in experiment.Noise level (adding hush pipe 2) and vibration meet standard.
The KCBF-110 switched reluctance machines that has adopted Shanxi anti-explosion motor Co., Ltd to produce, ZJT-160/660KC-JI Flameproof intrinsically safe magneto resistance speed-regulating device.Be the continuous speed regulation system of electromechanical integration, following characteristics is arranged: 1, detent torque is 150% of nominal torque, and inrush current is only 30% of rated current, is applicable to the machinery of frequent starting and clockwise and anticlockwise.
2, can realize clockwise and anticlockwise electrodynamic braking four-quadrant operation.
3, the revolution precision is high, and dynamic response is fast.
4, system architecture is simple and reliable, keeps high-efficiency operation in whole speed adjustable range.
The security level IP54 of motor; Working method S1; Voltage 660V; Rated power 110KW; Efficient 94.8%.
The maximum short circuit current 85mA(effective value of Flameproof intrinsically safe magneto resistance speed-regulating device); High open circuit voltage 20V(effective value) rated power 132KW, efficient 98.2%.
Claims (4)
1. speed change twin-stage axial flow portable blower, comprise frame (3), be provided with motor (6) in frame (3), it is characterized in that: the output shaft (7) of motor (6) is stretched out by the two ends of motor (6), and the two ends of described output shaft (7) are connected with sencond stage impeller (8) with one-level impeller (4) respectively; Frame (3) is upper is provided with wind collecting unit (1) corresponding to one-level impeller (4), leads (9) after arranging corresponding to sencond stage impeller (8), and leading (9) rear portion after having is Diffuser (10); Described motor (6) is switched reluctance machines.
2. a kind of speed change twin-stage axial flow portable blower according to claim 1, is characterized in that: lead (5) in frame (3) in being provided with between one-level impeller (4) and sencond stage impeller (8).
3. a kind of speed change twin-stage axial flow portable blower according to claim 1, it is characterized in that: described wind collecting unit (1) is outside equipped with hush pipe (2), and described Diffuser (10) is the noise reduction Diffuser.
4. a kind of speed change twin-stage axial flow portable blower according to claim 1 is characterized in that: described motor (6) is connected with the magneto resistance speed-regulating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110427491 CN103174681A (en) | 2011-12-20 | 2011-12-20 | Variable speed twin-stage axial-flow local fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110427491 CN103174681A (en) | 2011-12-20 | 2011-12-20 | Variable speed twin-stage axial-flow local fan |
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| Publication Number | Publication Date |
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| CN103174681A true CN103174681A (en) | 2013-06-26 |
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| CN 201110427491 Pending CN103174681A (en) | 2011-12-20 | 2011-12-20 | Variable speed twin-stage axial-flow local fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626560A (en) * | 2015-11-25 | 2016-06-01 | 平安电气股份有限公司 | All-plastic local ventilator |
| CN109139510A (en) * | 2018-09-06 | 2019-01-04 | 吴宇铮 | High-speed and energy-saving single-stage mine local fan |
-
2011
- 2011-12-20 CN CN 201110427491 patent/CN103174681A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626560A (en) * | 2015-11-25 | 2016-06-01 | 平安电气股份有限公司 | All-plastic local ventilator |
| CN109139510A (en) * | 2018-09-06 | 2019-01-04 | 吴宇铮 | High-speed and energy-saving single-stage mine local fan |
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| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130626 |